Abstract: The objective of this study was to develop first aid guidelines, based on expert consensus, that provide members of the community with information on how to assist someone who is thought to be developing or experiencing an eating disorder. An online Delphi study was carried out with expert panels consisting of 36 clinicians, 27 care-givers and 22 consumers. The panel members rated statements that described potential first aid actions. If between 80 and 100 percent of all three panels rated a statement as either Essential or Important, the statement was endorsed as a guideline. Three rounds were conducted before consensus was reached. From a total of 456 statements, 200 were endorsed as guidelines. A cohesive guideline document was developed by writing the endorsed statements into sections of prose based on common themes. Clinicians, care-givers and consumers were able to reach consensus about guidelines for eating disorder first aid. Further research is needed to evaluate their efficacy.